Elastic composition.



andirom-J; to 1.

UNITED sTAtgEs PATENT OFFICE.

Eaton KARL narnnislnons'r, u most, ERMANY, issreuoa 'ro mam summon, r mrraunsonnau,ornanecnoyeennlur.

1 anaemic courosr'rxon.

5 Specification of Lqtterl Potent,

numeral;- 13,1900.

; l Application filed Nfuveinberil, 1.968. flerlll 1T0. 484.8491 x To all whom it meg concern." r Bert known that l, Enron l AlllzhlATIlIAS llons'ry-a snbjcctol the German l l'npcrory and resident otAlt-oua, m thcitlerman.lun

)liG, have invented a certain new. and uscl'ul improved Elastic Composition, of which the l'ollowingis o specifications 'lhisinyention relates to thepro vluction or manufacture of on elastic.cmuposition and consists substantially indissolvimg one or more suitable colloids in u'lycerin, and adding salicylic acid, tannin, lysolorm and hexa metl1ylene-tetram1n to thesolutiom ,Lyso

formaldehyde aml soap solution; The improved ctnnposxtion is more perform is e mixture of about equal parts of tieularly designed for use as 'orceilient filling. for the tires of motor vehicle wheels, and cycle wheels, andior cushions end the like.- It can also beclnployed \ril h advantage as an insulator for electricity,heat and cold.

The process of manufacture of tho improved composition]and the :{proportions oi its constituents moy. be variei are added (preferably just before use, for instance before charging into the hollow tire of a motor vehicle wheel) alter thehasie mate rial has been. heated to from to degrees contigrade, from 2 to 12 per eenhof lyso'l'orm tetramin. The whole is then thoroughly mixed to ethcr, whereupon it is ready for use, that is to say for charging into the hollow tire or the like. On cooling, the result ing composition is an elastic substance re scmbling gelatin; it is very soft end its clos tieity is permanent, that 1s to sey, the composition yields to all pressure but always resmiles its original shape after the pressure is removed.

Various processes and materials have been proposed for the manufacture of elastic courpositlons for hlhng hollow tires and the like,

destroyed. p p l 4 Attempts-to improve the above mentioned. chromated tftilltlilllOUS compositions ,by'the but a compo smon giving very sotiulactoryresults may be per cent. oi hcxamethy'lene such compositions have been composed mainly ol a gelatinous "substainsce'such 'asfglue or rlyccrin, with a. hardening agent such as potassium biehroumte." eomposithin of that hind when freshly nuuleyhese tczxture butis not suitable foruse Hi5:'tt*filll.)i4tlt1ll6l0? an m the t1 res. ol motorvelneles &c.,becouse it lstoo hurdlessmouthrunning. "After a certain tiuicsuch a composition becomes heav o'rl'ast moving: vehicles.

addition I of respcd eaoutclmuc, f'havei been unsuccessful, because since oeoutclioiur. is not soluble in glycerin and utter, it can only ontor-in mechanicaludmixturewiththc'com position. It hasulso been'proposo'd to"re place the potassium .hichromate by an. equal quantityoitannin. Such o litrg puurtity ottannin however lmrdens gels ")us sub-- stances, ond' 'thcrcirn'erdiminishes" the clesticity ofthe composition. A furthcr'idrawlil) or quality somewhatsimilar to oaoutchouo/ powder when used under ltselast elty and load-carryms capacity are then oi course p heck is that such a mixture ofgelatinoussul stance, glycerin, watchund ftannin, hose much too low melting point to besuiteble for use as e idling, for the hollow tires oi? motor vehicles. The addition of salicylic acid to a. composition oi that kind has alweys been proposed solely for antiseptic purposes, Further, a mixture ofiormalin glue with glycerin as already proposed has the same drawbacks es the shove mentioned chromated gelatinous compositions. Formaldehyde has a hardening action on glue and elatin so that the mixture very soon crurniles and loses its chisticity. When used its a filling for the tires of motor vehicles, the mixture is at first very hard to run on, and afterward becomes reduced to powder. In consequence of the loss of formaldehyde, a slight increase in temperature such as that produced by the friction of the the tubes or covers, causes the mixture to nieltand beoomeluseless. H a v Com ositions composed of formalimgelatin wit rout an addition ofglyeerin are quite useless for the purposes in view because such compositions will begin to freeze at O degrees centigrade.

N ow a composition manufactured ucc0rding to the present invention is a real gelatin,

of such softness and elasticit that it will react to any pressure and wil resume immediately its original sha 0 when relieved of pressure. Notwithstan ing its softness the consistency of the composition is such that it is not melted by the rise in temperature due to friction in use, and it retains this pro )erty of infusibility combined with great so tness constantly without acquiring the hardness which would render the composition brittle and crumbling. This constancy of softness and elasticity is due to the absence of the chromates, to the presence or use of a not too large quantity of tannin, and to the presence or use of a sufficient amount of salicylic acid which acts to decompose slowly the lysoform, and more especially the hexamethylenetetramin and thereby maintains constant the elasticit and infusibility of the gelatinous materia which would otherwise diminish. Moreover the salicylic acid has the property of keeping the gelatin treated therewith permanently soft and of preventing wholly or to a great extent the same from becoming hard examethylene-tetramin scribed.

it becomes soon so resistant that it will not be meltedby heating within the limits of ordinary use and will not become hard.

' This very important property isdue to the fact that beforethecom osition is charged into the tire, only a fraction of the lysoform and of the hexamethylenetetramin comes into action-just sufficient to produce the requisite elasticity and infusibility, which conditions are maintained by the action of l the acid, due to the heat produced by the use of the filled tire. The permanent softness is due more especially to the salicylic acid. The improved composition is suitable for use as a substitute for a filling of compressed air, whereas all hard compositions resembling caoutchouc, give hard running tires like solid tires and are useless.

. I claim: 1

1. The herein-described improved elastic composition of matter consisting of a colloid, l glycerin, salicylic acid, tannin, ysoform and substantially in the proportions as descri ed and for the purpose s ecified. V

2. he herein described composition of matter consisting of one part by weight of Japan glue (tjen-tjan,) two to six arts by Weight of heated glycerin, two to three per cent. of salicylic acid, one to two per cent. of tannin, twoto twelve percent. of lysofor'm and from one fourth to one half per cent. of hexamethylenetetramin, substantially as de- ERICH KARL MATHIAS HOLS'l.

Witnesses: I I

MAX F. A. KAEMPFF, ERNEs'r H. L. MUMMENHOFF. 

